$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-u-abourgeois2-9582-28332/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-abourgeois2-9582-28332/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin 81291c8822b7bade9fe20bbb09c8525a1d43a4f0:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         81291c8822b7bade9fe20bbb09c8525a1d43a4f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81291c8 bump release for test build